com.appdynamicspilot.persistence.BasePersistenceImpl.java Source code

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Here is the source code for com.appdynamicspilot.persistence.BasePersistenceImpl.java

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/*
 * Copyright 2015 AppDynamics, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.appdynamicspilot.persistence;

import java.io.Serializable;

import org.apache.log4j.Logger;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.*;

/**
 * @author Vikash
 *
 */
public class BasePersistenceImpl {

    private final static Logger LOGGER = Logger.getLogger(BasePersistenceImpl.class.getName());

    private EntityManagerFactory emf = null;

    private EntityManager em = null;

    private static final int DEFAULT_INTERNAL = 15;

    private int interval = DEFAULT_INTERNAL;

    /**
     * Logger for this class
     */
    private static final Logger logger = Logger.getLogger(BasePersistenceImpl.class);

    /**
     * The method to update the serailizable business objects into the database.
     * 
     * @param object --
     *            serializable object
     * @throws PersistenceException
     */
    @Transactional
    public void update(final Serializable object) {
        EntityManager entityManager = getEntityManager();
        EntityTransaction txn = entityManager.getTransaction();
        txn.begin();
        try {
            entityManager.merge(object);
        } catch (Exception ex) {
            logger.error(ex);
            txn.rollback();
        } finally {
            if (!txn.getRollbackOnly()) {
                txn.commit();
            }
        }
    }

    public EntityManagerFactory getEntityManagerFactory() {
        return this.emf;
    }

    public void setEntityManagerFactory(EntityManagerFactory factory) {
        this.emf = factory;
    }

    public EntityManager getEntityManager() {
        return EntityManagerHelper.getInstance().getEntityManager();
    }

    public void setEntityManager(EntityManager em) {
        this.em = em;
    }

    @Transactional
    public void save(final Serializable object) {
        EntityManager entityManager = getEntityManager();
        EntityTransaction txn = entityManager.getTransaction();
        txn.begin();
        try {
            entityManager.persist(object);
        } catch (Exception ex) {
            logger.error(ex);
            txn.rollback();
        } finally {
            if (!txn.getRollbackOnly()) {
                txn.commit();
            }
        }

    }

    @Transactional
    public void delete(Serializable object) {
        EntityManager entityManager = getEntityManager();
        EntityTransaction txn = entityManager.getTransaction();
        txn.begin();
        try {
            entityManager.remove(object);
        } catch (Exception ex) {
            logger.error(ex);
            txn.rollback();
        } finally {
            if (!txn.getRollbackOnly()) {
                txn.commit();
            }
        }
    }

    /**
     * @return the interval
     */
    public int getInterval() {
        return interval;
    }

    /**
     * @param interval
     *            the interval to set
     */
    public void setInterval(int interval) {
        if (interval < 0) {
            LOGGER.warn("Invalid interval: " + interval + "; setting to default: " + DEFAULT_INTERNAL);
            this.interval = DEFAULT_INTERNAL;
        } else {
            this.interval = interval;
        }
    }

    protected boolean shouldFireSlow() {
        return (Math.random() * 100) <= interval;
    }

}